From the Popular Mechanics article, authored by Jay Bennett:
Advice from some of the survivalists who competed on the History Channel’s show Alone.
Flora can be trickier to identify than fauna. There are many instances where two plant species look similar, but one is edible and the other is not. Yarrow, for example, is a flowering plant with medicinal benefits, but it can be mistaken for highly toxic water hemlock if you haven’t learned how to distinguish them, says Nicole Apelian, a survivalist from the Pacific Northwest who spent time camping in Botswana with the San Bushmen and was a contestant on the second season of Alone, also set in Vancouver Island.
Read the full article at Popular Mechanics.